Gearing.



F. A. LAW.

GEARING. APPLICATION FILED OUT. 25, 1911. 1,98, 1 2. Patented June 2,1914.

d 6i li 66 I 0 j o Wiiwymao I A $11!" 3 mm Wcoz 3 33. 24 mlfozuegafmmTED STATES PATENT oEEIoE.

FRED A. LAW, OF ROCHESTER, NEW YORK, ASSIGNOR TO THE COLUMBIA MOTOR CARCOMPANY, A. CORPORATION OF CONNECTICUT.

' GEAEING.

Specification ofLetters Patent.

Patented J unc 2, 1914.

Original application filed February 5, 1902, Serial No. 92,677. RenewedJuly 8, 1907, Serial No. 382,721. Divided and this application filedOctober 25, 1911. Serial No. 656,707.

To all whom it may concern Be it known that l, FRED A. LAW, a citizen ofthe United States, and resident of Rochester, in the county of Monroe,State of New York, have invented certain new and useful Improvements inGearing, of which the following is a specification, reference being hadto the accompanying drawings, forming a part hereof.

This application is a division of renewed application Ser. No. 382,721,filed July 8th, 1907, original Ser. No. 92,677, filed February 5th,1962, and relates to gearing, particularly such as is used in changespeed mechanism or; in other cases where complementary gears are slidinto and out of mesh.

. As shown in the accompanying drawings the caring is designedparticularly for use in t e change speed box of self-propelled vehicles,but it is, of course, understood that the particular form shown anddescribed is only one of many methods which may be used in carrying outmy invention.

Among the objects of my invention is to produce a form of gearing tofacilitate throwing or sliding gears into engagement with a minimum ofslip between the rotating parts and minimum liability of fracture, toinsure easy and positive engagement of the gears as they are shifted,and other objects which will be apparent from the following.

In the drawings Figure 1 in part is a plan view of the interior of agear box or casing showing two sets of complementary gears. Fig. 2 is afront face view of one of the gears. Fig. 3 is an edge View of the same,showing the relative arrangement of the gear proper and itsengagementplate. Fig. 4 is a front face view of the engagement-plate.

In Fig. 1, 9 is a driving-shaft; 11 is a countcrshaft; 61 is a gearcapable of sliding on the squared portion of the driving-shaft 9; 62 isa shifting-arm attached to shiftingbar 67, reciprocated by any suitablemeans, not shown; 63 is a fixed gear on the drivingshaft; 64 is a fixedgear on the countershaft; 65 is a gear capable of sliding on thecountershaft 11; 66 is an extension-arm attached to arm 62, but reachingto a collar or yoke on sleeve 68, carrying the gear 65.

Part 2 is the lower section of the gear casing supporting the shafts.

59 is a gear and 60 is a disk or shroud for attachment to the side ofthe gear.

It will be seen that by reciprocating the shifter-bar 67, the arm 62 andits extension 66 are moved, and by other connections, respectively bycollars in grooves on the hubs or sleeves of gears 61 and 65, suchreciprocation shifts or slides the gears so that gear 65 will be throwninto mesh or engagement with gear 63, and gear 61 will be thrown intomesh with gear 64. The matter of shifting or sliding gears is dealt withgenerally in the original application, of which this is a division,while this divisional case pertains to the gears or gearing used forthat purpose. 5 In the particular form here shown. and described, themain or driving portion of the gear .59 is formed as in the ordinarymanner and is shrouded at the side which ,first engages the mating gear,by a disk having a less number of teeth than the main portion of thegear. As shown in the drawings, this shroud is provided with half thenumber of teeth employed on the main portion of the gear and when theparts are secured in place, it appears that the alternate teeth of thegear are cut away at one end. The advantages of this construction areapparent as the disk 60 may be made of any desired material and may behardened to any desired degree, at the same time being made removableand renewable. In sliding gear mechanisms the gear teeth are very oftenchipped and broken or worn away to a great extent by the slipping actionas they come into engagement, and where a full number of teeth isprovided, extending across the entire face of the gear, it is moredifficult to cause engagement of the sliding gears when they are runningat. comparatively high speeds.

By providing a shroud, or cutting away the ends of the alternate teethor the ends of the teeth on one or both of the gears, a greater space isprovided which insures quick engagement of the gears as they are slidinto mesh, whereupon they may be easily slid into full driving position.Of course, a shroud may be provided at either or both sides of a geardependent upon its use, shrouds only being used on the opposing sides ofthe two mating gears. The number of teeth in the a shroud, the ends ofthe alternate teeth on a gear may be cut away though it is preferred touse a shroud for the purposes of hardening and renewal.

In the practice of my invention it will be seen that the ends of theteeth which are slid toward another gear, are narrow as compared withthe space into which they are to slide, and while I have shown one formof embodiment of my invention, it will be seen that if teeth on one gearhave their faces cut away at the end of the teeth, that will likewiseleave a much smaller end on the teeth as compared with the space,circumferentially, on the other gear into which they are to he slid andengage.

While I have shown my invention as embodied in one form, there arevarious ways in which it may be used, and I do not wish to limit myselfto the particular form shown and described, but

What I desire to secure by Letters Patent is:

1. In combination in a change speed gearing, a series of movable gearsprovided upon their engaging sides with a less number of gear teeth thanupon the working faces of the gears.

2. A gear for a change speed mechanism provided with a body portionhaving gear teeth extending across the entire face of the gear, andhaving a series of teeth of a less length than the face of the gear.

3. A gear provided. with a body portion having teeth extending acrossits entire face, and a shroud provided with teeth adapted to registerwith certain of the teeth of the body portion.

45' A gear provided with a body portion having teeth extending acrossits entire face, and a shroud provided with teeth adapted to registerwith certain of the teeth of the body portion, and means for firmlyuniting said body portion and shroud.

5. In combination with complementary sliding gears, a gear having spacesbetween the teeth at one end of greater extent, cireumferentially, thanthe opposing ends of the teeth on the interengaging gear.

6. A gear for change speed mechanism havinga rim portion with normalteeth out therein having their ends flush with or within the lateralfaces of the gear, said teeth having substantially equal spaces andteeth, and an end portion of the teeth at which the spaces are greaterthan the normal width of the tooth ends throughout the rest of theteeth.

7. A gear adapted for sliding into lateral engagement with another gear,said gear having teeth and spaces on its face substantially equaleircumferentially on the pitch line throughout the major portion of thetooth face, said teeth at one end being cut away within the lateral sideof the gear wheel, whereby in the plane of the side the circumferentialextent of the spaces is.

greater than the tooth ends, for the purpose described.

This specification signed at Rochester, State of New York, this 20th'dayof October, 1911.

FRED A. LAW.

lVitnesses I JOHN W. OsBoRN, THERESA L. OSBORN.

